It is not like you cannot use your system during the thirty minutes of
update.
According to http://distrowatch.com/trisquel there is no Trisquel 4.2. There
is Trisquel 4.0 and Trisquel 4.5.1. It really is not advisable to use those
older releases: none of them is supported today! That means in particular
that vulnerabilities are not corrected.
Use Trisquel 7 or (if for some reason you like older versions of the
programs) Trisquel 6. Whatever the version of Trisquel you can update the
kernel: https://trisquel.info/en/wiki/update-linux-libre-kernel
The kernel is, alone, responsible for the hardware support you experience.
